> the system could demand the cars are moving (cell network can
> see that) so that it can’t be used to reach your cell phone
> while you are not driving

In other words, you are suggesting a system that actively encourages the use of cell phones while driving.

I see idiots paying more attention to the phone than the road on a daily basis. I was nearly hit head on by a guy who was so engrossed in his conversation that he crossed the centerline. When he finally realised that he was a second or two away from hitting me, he seemed more annoyed about his call being interrupted than concerned about the near miss.

Laws against talking while driving make me a little uncomfortable, since they infringe on a person's freedom to be an idiot. But when the stupidity is as likely to kill an innocent bystander as it is to kill the idiot, you can't rely on Darwin. Therefore, I reluctantly support those laws.

Whether there are laws against talking while driving or not, this is just a bad idea.